I think they can probably incorporate a few of the scenes between the Professor and Magneto, even if they switch around a few words. For example...

Magneto: [pointing to his head] Are you sneaking around in here, Charles? Whatever are you looking for?
Prof. Charles Francis Xavier: I'm looking for hope.
Magneto: I will bring you hope, old friend, and I ask only one thing in return - don't get in my way.
[walks away]
Magneto: We are the future, Charles, not them. They no longer matter.

I'm hoping for "Mutation, it is the key to our evolution, it has enabled us to evolve from a single cell organism into the dominant species on the planet, this process is slow normally taking thousands and thousands of years, but every few hundred millenia, evolution leaps forward." (at the beginning, at the CIA briefing, don't care, but it would be fun hearing it).

"You had me at Hello" - Mystique to Hank
"You can't handle the truth" - Charles to CIA
"We take the cash. We cash the cheques and we show them what they wanna see" - Emma to Angel

HAHA these made me laugh.

"I am your father." - Azazel to Mystique's tummy.

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"You can leave a penny, you can't take a penny. You can leave a penny anytime. You have to spend $10 to take a penny. Store policy."
"Since when has this been store policy?"
"Uh, since my boss made up the policy. You gonna pay? You're holding up my line of one other person. You can't afford your milk, step aside. What, daddy didn't give you enough milk money? Little baby gonna cry about it? Just step aside."And that is how Uncle Ben dies.

Magneto: You actually go outside in these things?
Professor X: What would you prefer? Black leather?

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Quote:

Originally Posted by Warren Ellis

Cyclops is the best superhero in the world. He is, as far as I'm concerned, the Batman. He's been in intensive training since his early teenage years to lead the first-ever mutant rescue and security team. This is a guy who gets up every morning asking himself how he can be better.

don't think they would try to reuse dialog to do a wink to the other movies, seems like something you would do if you had more time between films. or if singer wasn't involved. it's just a cheesy thing to do

oh here is one for the other playful side of this thread
"we're gonna need a bigger blackbird".

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"fear should not exist in your mind, if you fear you will never accomplish anything"

I do hope we don't have repeated dialogue. I don't need to be bludgeoned over the head with character connections. It would be a bit lazy to have them saying the same stuff they've already said (or, rather, will say later in their lives).